John johnson



J.JOHNSON.

, Steam Heater.

v No. 85,177. Pate'htedDec. 22,1868

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JOHN JOHNSON, or sAoo, MAINE, ASSIGNOR TO NEW ENGLAND' STEAM-HEATING COMPANY OF BOSTON, MASSACHUSETTS.

Letters Patent No. 85,177,'lated December 22,1868.

IMPROVEMENT 1N STEAM-HEATERS.

The Schedule referred to in these Letters Patent and making part: of the same.

To all whom it may concern:

Be it known that I, J OHN JOHNSON, of Saco, in the county of York, and State of Maine, have invented a newand useful Improvement in Radiators; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, making a part of this specification.

Figure I is a front View of the radiator, partly in section.

Figure II is an end view of the same.

This improvement relates to an apparatus for receiving heated air from a furnace, or hot-steam from a boiler, for the purpose of heating and. ventilating apartments.

It is so arranged that a thin stratum or column of steam or hot air is exposed on two sides to the external air that is to be heated, the combined area of the I surface of these two sides being much greater than the exposed surface of. the radiators now commonly used.

The steam or hot air has a direct passage through the radiator, and, as it does not follow a tortuous course,

7 its movement israpid, and the whole interior is quickly When steam is used, condensation takes place rapidly, inducing a swift current of the external air through the heated central tubes.

The radiator, Figs. I and II, is supported by a suitable stand, A, attached to the base, B. V

This base or lower section of the apparatus consists of a hollow box or compartment, having at one end the aperture G, in which is fitted the stop-cock I. Th steam or hot air is admitted at this point.

The top of the radiator consists of a similar box, 0, having an aperture, H, and a stop-cock, J, for the escape of steam, whenever it is desirable to blow it through the apparatus, or to discharge the air.

The two hollow boxes B and Care connected 1 with each other by a series of vertical pipes, D D DI, havbig one end secured to the bottom plate of the upper box, and the other .end to the top plate of the lower box.

Within each of the tubes DD there is a central tube, E, of less diameter than the outer tube, having its upper end in the top plate of the upper box 0, and its lower end in the bottom plate of the lower lox B, thus afibrding a free passage for the external air,

which enters at the bottom of the radiator, near the floor of the apartment, and escapes and is diffusedat the top of the upper box.

Between the central tube E and the larger exterior tube D there is an annular space, F, through which the steam or 'hot air from a boiler orfurnace passes, and heats both the outer and inner tube, both of which are hi contact with the external air. It will be understood that all of the steam, or hot air from the gene rator of heat, passes through the annular space F, between the pipes D and E, which afford a large radiat ing-surface.

In the preceding description, I have mentioned but two vertical concentric pipes, but it is obvious that any number of concentric pipes or tubes may be employed,

in which each alternate space is used for the reception oflsteam or hotair and the transmission of the external air.

What I claim, and desire to secure by Letters Patent, is-

The combination ofthe' central pipe E, the outer pipe D, and the top and bottom chambers Band C, substantially as described, and for the p wpose specified.

I JOHN JOHNSON. [1 s.]

'Witnesses: JOHN M. BATCHELDER, FRANKLIN HUNT. 

